Hole spotter for collaring drill holes



Jam 1, 1935. c. A. HIR$CHBERG HOLE SPOTTER FOR COLLARING DRILL HOLES 2 Shets-Sheet 1 Filed May 31, 1933 CHARLES fiflmscuaaae;

INVENT OR A ORNEY Jan. 1, 1935. c. A. HIRSCHBERG HOLE SPOTTER FOR COLLARING DRILL HOLES Filed May 31, 19:55 2 She ets-Sheet 2 UHaRLEs flHms enema INVENTOR 7 A ORNEYY Patented Jan. 1, 1935 1,986,266

UNITED STATES PATENT OFFICE HOLE SPOTTER FOR COLLARING DRILL HOLES Charles A. Hirschberg, Mountain Lakes, N. J., as-

signor Worthington Pump and Machinery Corporation, New York, N. Y., a corporation of Virginia Application May 31, 1933, Serial No. 673,647

4 Claims. (Cl. 255-45) This invention relates to rock drilling and more bit for holding the drill bar steady to permit the particularly to a hole spotter for collaring drill starting or collaring ofthe drill hole without rehole quiring the use of the drillers assistant.

An object of the present invention is to provide In the preferred form of the invention shown a hole spotter for col aring drill holes embodying a in Figures 1 to 5 inclusive, the hole spotter com- 5 drill bar engaging member for steadying the prises an attaching body 1 which has an opening drill bar during the spotting or starting of a 2 extending therethrough. The opening 2 redrill hole, which device embodies means for ready ceives a stud 3 formed on the cap 4 and a nut 5 and secure attachment to a percussive rock drill is provided for securely attaching the carrying and is so constructed that after a hole has been or attaching body 1 to the cap 4. The cap 4 forms 10 spotted it may be folded or moved out of the way the end of the feed cylinder 6 of the pneumatic of the drill during the finishing of the drill hole. feed mechanism of the percussive tool construc- With these and other objects in view as may tion A. A plate 7 is attached to the body 1 and appear from the accompanying specifications, the is adapted to engage the cylinder structure 6 to invention consists of various features of conprevent turning or rotarymovement of the body 1. 15 struction and combination of parts, which will A supporting rod 8 is rotatably carried by the be first described in connection with the acsupporting body 1 and it rotates within the body companying drawings showing a hole spotter 1. The ends 9 of the supporting rod 8, which for collaring drill holes of the preferred form project beyond the side edges of the body 1 are embodying the invention, and the features formflat as clearly shown in Figures 3 and 5 of the 20 ing the invention will be specifically pointed out drawings and they have drill bar engaging memi th d m bers 10 and 11, pivotally connected to these flat- In th drawings; tened ends by means of suitable pivot pins 12. Fig. 1 is a side elevation of the improved hole The provision of the pivot pins 12 and the rotary spotter showing the same applied to a percussive mounting of the rod 8 permits the drill bar 25 rock drill. engaging members 10 and 11 to move in a uni- Fig. 2 is an end elevation of the hole spotter, versal manner with respect to the body 1 so as Fig. 3 is a side elevation of the hole spotter. to permit them to be moved downwardly and Fig. 4 is a. detail cross section through the hole outwardly into the p io a u y e emspotter taken on th i 4 4 of Figure 2, ber 11 in Figure 5 of the drawings, after the hole 30 Fig. 5 is a detail perspective view of the hole has e Sp tted or started. spotter showing the same in a partly open posi- The members 10 and 11 are provided with cut tion, out portions 14 in their inner facing edges which Referring more particularly to the drawings, a out portions engage a rib 15 formed on percussive or pneumatic rock drill of any apbody 1 50 as to Prevent y Pivotal rocking 35 proved type is shown t A in Figure 1 of t movement of the members 10 and 11 with redrawings; While in Figure 1 a drill of the pneuspect to the b y 1 when the members 10 and matic feed type is illustrated, it is to be under 11 are in drill bar engaging posit on. stood that the improved hole spotter may be used The members 10 and 11 are P d w th Semi- 40 in connection with any suitable type of percussive cylindrical cutout portions near their outer free 40 tool without departing from the spirit of this inends which are of sufficient i e to fi y rip 1 the drill bar B and hold it against oscillatory The percussive tool A has a drill bar B carried wobbling e t, When the members 10 thereby and as shown in Figure 1, the drill bar d are in their upright drill ba n agin is in position for the starting of a drill hole in positlon. 45

t rock or other substance Suitable means are provided for locking the When starting a drill hole in rock particularly members 10 and 11 in their upright d i l bar when the surface is irregular, the drill bar B has engaging Position and While a p fi yp o a tendency to oscillate or wobble, rendering it locking means is illustrated in th d wi s, and

difficult to spot a hole and requiring, in normal hereinafter described, it is to be understood that operation, a drillers assistant to hold the drill ny suitable yp f l ki me n m y be embar B steady until the drill hole is started. ployed without departing from the spirit of the The present invention embodies a hole spotter present invention.

for attachment to the percussive drill or tool The locking means illustrated in the drawings which will engage the drill bar B adjacent to the comprises a substantially U-shaped looking bar 17 which is slidably carried by the member 11,

being guided in its sliding movement by suitable guide pins 18. Locking pins 19 are carried by the member 10 and are engaged by the hooks 20 on the ends of the U-shaped locking bar 17 when the latter is in looking position. A suitable stop pin 21 is provided for limiting the downward movement of the U-shaped locking bar 17. A tightening or clamp screw 22 is carried by the member 17 and its inner end clamps against the facing side of the member 11 for securely tightening the hooks 20 on the locking pins 19 to lock the members 10 and 11 in their upright drill bar engaging position.

As shown in Figures 4 and 5 of the drawings, the supporting rod 8 may be out out as shown at 26 to prevent interference between the rod and the stud or stem 3 and permit unimpeded rotation of the rod 8.

In operation, when it is desired to start a drill hole, the drill hole spotter is attached to the percussive tool or drill A by mounting the body 1 upon the stud 3 and tightly clamping it in place against the end of the cap 4 by means or the nut 5. After. the hole spotter has been securely clamped to the percussive tool rig, the members 10 and 11 are swung upwardly until the drill bar'is engaged in the cutout portions 16, and the locking bar 1'7 is then swung on its supporting pin 18 until the hooks 20 engage the locking pins 19 after which the looking or clamp screw 22 is tightened to securely lock the members 10 and 11 in their drill bar engaging position, for hold ing the end of the drill bar steady to permit spot-- ting or collaring of the drill hole. After the drill hole has been started, and has gained suflicient depth to act as a steadying medium upon the cutting end of the drill bar, the clamp screw 22 is loosened, and the locking bar 17 is swung upwardly and outwardly to disconnect the members 10 and 11. These members are then moved outwardly and downwardly, and if necessary either forwardly or rearwardly by rotating the pins 12 or rod 8 so that they will be down out of the way of the chuck end of the percussive tool as it approaches the surface which is being drilled.

From the foregoing description taken in connection with the accompanying drawings, it will be apparent that a hole spotter for collaring drill holes has been provided, which issimple in construction, may be attached to any approved type of rock drilling rig or percussive tool rig and will serve to hold the drill bit end of the drill bar steady, against vibration or wobbling during the starting or spotting of a drill hole, one which will consequently eliminate the use of an assistant driller for this purpose, as well as a device which can be quickly swung out of position after the drill hole has reached suflicient depth to render further use of the spotter unnecessary.

It will be understood that the invention is not to be limited to the specific construction or arrangement of parts shown but that they may be widely modified within the invention as de- V fined by the claims.

What is claimed is:

1. In a hole spotter for collaring drill holes, a pair of drill bar guiding members, a support for said members, said members pivotally comiected to said support to permit them to be swung away from a drill bar, a universal connection between said members and said support, means for looking said members in drill bar guidingposition, and means for preventing rotary movement of said support relative to a drill bar.

2. The combination with a percussive drill, a

drill bar, and a feeding mechanism for the drill, I

of a hole spotter for collaring drill holes including a support, means for attaching said support to said feeding mechanism, a plurality of drill bar guiding members pivotally carried by said support for movement into and out of drill bar guiding position and means connecting said members to said support to permit universal swinging movement of the members relative to'said support.

3. The combination with a percussive drill, a

drill bar and a feeding mechanism for the drill of a hole spotter for collaring drill holes including a support, means for attaching said support to said feeding mechanism, a plurality of drill bar guiding members pivotally carried by said support for movement into and out of drill bar guiding position, means connecting said members to said support to permit universal swinging movement of the members relative to thev support, a rib on said support, said members provided with recesses to receive said rib to prevent movement of the members relative to the support when in drill bar engaging position.

4. The combination with a percussive drill, a drill bar and a feeding mechanism for the drill, of a hole spotter for collaring drill holes including a support, means for attaching said support to said feeding mechanism, a plurality of drill bar guiding members pivotally carried by said support for movement into and out of drill guiding position, means connecting said members to said support to permit universal swinging movement of the members relative to the support, a rib on said support, said members provided with recesses to receive said rib to prevent movement of the members relative to-the support when in drill bar engaging p sition, and means for locking said members in or out of drill bar guiding position.

CHARLES A. HIRSCHBERG. 

